blob: 6d412d5d52e7631f85b2ee5766ecd7632110f6b0 [file] [log] [blame]
Doug Zongkerbc7ffed2014-08-15 14:31:52 -07001/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <ctype.h>
18#include <errno.h>
19#include <fcntl.h>
20#include <inttypes.h>
21#include <pthread.h>
22#include <stdarg.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/types.h>
27#include <sys/wait.h>
28#include <sys/ioctl.h>
29#include <time.h>
30#include <unistd.h>
31
32#include "applypatch/applypatch.h"
33#include "edify/expr.h"
34#include "mincrypt/sha.h"
35#include "minzip/DirUtil.h"
36#include "updater.h"
37
38#define BLOCKSIZE 4096
39
40// Set this to 1 to interpret 'erase' transfers to mean do a
41// BLKDISCARD ioctl. Set to 0 to interpret erase to mean fill the
42// region with zeroes.
43#define DEBUG_ERASE 0
44
45#ifndef BLKDISCARD
46#define BLKDISCARD _IO(0x12,119)
47#endif
48
49char* PrintSha1(const uint8_t* digest);
50
51typedef struct {
52 int count;
53 int size;
54 int pos[0];
55} RangeSet;
56
57static RangeSet* parse_range(char* text) {
58 char* save;
59 int num;
60 num = strtol(strtok_r(text, ",", &save), NULL, 0);
61
62 RangeSet* out = malloc(sizeof(RangeSet) + num * sizeof(int));
63 if (out == NULL) {
Doug Zongker1d5d6092014-08-21 10:47:24 -070064 fprintf(stderr, "failed to allocate range of %lu bytes\n",
Doug Zongkerbc7ffed2014-08-15 14:31:52 -070065 sizeof(RangeSet) + num * sizeof(int));
66 exit(1);
67 }
68 out->count = num / 2;
69 out->size = 0;
70 int i;
71 for (i = 0; i < num; ++i) {
72 out->pos[i] = strtol(strtok_r(NULL, ",", &save), NULL, 0);
73 if (i%2) {
74 out->size += out->pos[i];
75 } else {
76 out->size -= out->pos[i];
77 }
78 }
79
80 return out;
81}
82
83static void readblock(int fd, uint8_t* data, size_t size) {
84 size_t so_far = 0;
85 while (so_far < size) {
86 ssize_t r = read(fd, data+so_far, size-so_far);
87 if (r < 0 && errno != EINTR) {
88 fprintf(stderr, "read failed: %s\n", strerror(errno));
89 return;
90 } else {
91 so_far += r;
92 }
93 }
94}
95
96static void writeblock(int fd, const uint8_t* data, size_t size) {
97 size_t written = 0;
98 while (written < size) {
99 ssize_t w = write(fd, data+written, size-written);
100 if (w < 0 && errno != EINTR) {
101 fprintf(stderr, "write failed: %s\n", strerror(errno));
102 return;
103 } else {
104 written += w;
105 }
106 }
107}
108
109static void check_lseek(int fd, off_t offset, int whence) {
110 while (true) {
Doug Zongker1d5d6092014-08-21 10:47:24 -0700111 off_t ret = lseek(fd, offset, whence);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700112 if (ret < 0) {
113 if (errno != EINTR) {
114 fprintf(stderr, "lseek failed: %s\n", strerror(errno));
115 exit(1);
116 }
117 } else {
118 break;
119 }
120 }
121}
122
123static void allocate(size_t size, uint8_t** buffer, size_t* buffer_alloc) {
124 // if the buffer's big enough, reuse it.
125 if (size <= *buffer_alloc) return;
126
127 free(*buffer);
128
129 *buffer = (uint8_t*) malloc(size);
130 if (*buffer == NULL) {
Doug Zongker1d5d6092014-08-21 10:47:24 -0700131 fprintf(stderr, "failed to allocate %zu bytes\n", size);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700132 exit(1);
133 }
134 *buffer_alloc = size;
135}
136
137typedef struct {
138 int fd;
139 RangeSet* tgt;
140 int p_block;
141 size_t p_remain;
142} RangeSinkState;
143
144static ssize_t RangeSinkWrite(const uint8_t* data, ssize_t size, void* token) {
145 RangeSinkState* rss = (RangeSinkState*) token;
146
147 if (rss->p_remain <= 0) {
148 fprintf(stderr, "range sink write overrun");
149 exit(1);
150 }
151
152 ssize_t written = 0;
153 while (size > 0) {
154 size_t write_now = size;
155 if (rss->p_remain < write_now) write_now = rss->p_remain;
156 writeblock(rss->fd, data, write_now);
157 data += write_now;
158 size -= write_now;
159
160 rss->p_remain -= write_now;
161 written += write_now;
162
163 if (rss->p_remain == 0) {
164 // move to the next block
165 ++rss->p_block;
166 if (rss->p_block < rss->tgt->count) {
167 rss->p_remain = (rss->tgt->pos[rss->p_block*2+1] - rss->tgt->pos[rss->p_block*2]) * BLOCKSIZE;
Doug Zongker1d5d6092014-08-21 10:47:24 -0700168 check_lseek(rss->fd, rss->tgt->pos[rss->p_block*2] * (off_t)BLOCKSIZE, SEEK_SET);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700169 } else {
170 // we can't write any more; return how many bytes have
171 // been written so far.
172 return written;
173 }
174 }
175 }
176
177 return written;
178}
179
180// All of the data for all the 'new' transfers is contained in one
181// file in the update package, concatenated together in the order in
182// which transfers.list will need it. We want to stream it out of the
183// archive (it's compressed) without writing it to a temp file, but we
184// can't write each section until it's that transfer's turn to go.
185//
186// To achieve this, we expand the new data from the archive in a
187// background thread, and block that threads 'receive uncompressed
188// data' function until the main thread has reached a point where we
189// want some new data to be written. We signal the background thread
190// with the destination for the data and block the main thread,
191// waiting for the background thread to complete writing that section.
192// Then it signals the main thread to wake up and goes back to
193// blocking waiting for a transfer.
194//
195// NewThreadInfo is the struct used to pass information back and forth
196// between the two threads. When the main thread wants some data
197// written, it sets rss to the destination location and signals the
198// condition. When the background thread is done writing, it clears
199// rss and signals the condition again.
200
201typedef struct {
202 ZipArchive* za;
203 const ZipEntry* entry;
204
205 RangeSinkState* rss;
206
207 pthread_mutex_t mu;
208 pthread_cond_t cv;
209} NewThreadInfo;
210
211static bool receive_new_data(const unsigned char* data, int size, void* cookie) {
212 NewThreadInfo* nti = (NewThreadInfo*) cookie;
213
214 while (size > 0) {
215 // Wait for nti->rss to be non-NULL, indicating some of this
216 // data is wanted.
217 pthread_mutex_lock(&nti->mu);
218 while (nti->rss == NULL) {
219 pthread_cond_wait(&nti->cv, &nti->mu);
220 }
221 pthread_mutex_unlock(&nti->mu);
222
223 // At this point nti->rss is set, and we own it. The main
224 // thread is waiting for it to disappear from nti.
225 ssize_t written = RangeSinkWrite(data, size, nti->rss);
226 data += written;
227 size -= written;
228
229 if (nti->rss->p_block == nti->rss->tgt->count) {
230 // we have written all the bytes desired by this rss.
231
232 pthread_mutex_lock(&nti->mu);
233 nti->rss = NULL;
234 pthread_cond_broadcast(&nti->cv);
235 pthread_mutex_unlock(&nti->mu);
236 }
237 }
238
239 return true;
240}
241
242static void* unzip_new_data(void* cookie) {
243 NewThreadInfo* nti = (NewThreadInfo*) cookie;
244 mzProcessZipEntryContents(nti->za, nti->entry, receive_new_data, nti);
245 return NULL;
246}
247
248// args:
249// - block device (or file) to modify in-place
250// - transfer list (blob)
251// - new data stream (filename within package.zip)
252// - patch stream (filename within package.zip, must be uncompressed)
253
254Value* BlockImageUpdateFn(const char* name, State* state, int argc, Expr* argv[]) {
255 Value* blockdev_filename;
Doug Zongker1d5d6092014-08-21 10:47:24 -0700256 Value* transfer_list_value;
257 char* transfer_list = NULL;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700258 Value* new_data_fn;
259 Value* patch_data_fn;
260 bool success = false;
261
Doug Zongker1d5d6092014-08-21 10:47:24 -0700262 if (ReadValueArgs(state, argv, 4, &blockdev_filename, &transfer_list_value,
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700263 &new_data_fn, &patch_data_fn) < 0) {
264 return NULL;
265 }
266
267 if (blockdev_filename->type != VAL_STRING) {
268 ErrorAbort(state, "blockdev_filename argument to %s must be string", name);
269 goto done;
270 }
Doug Zongker1d5d6092014-08-21 10:47:24 -0700271 if (transfer_list_value->type != VAL_BLOB) {
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700272 ErrorAbort(state, "transfer_list argument to %s must be blob", name);
273 goto done;
274 }
275 if (new_data_fn->type != VAL_STRING) {
276 ErrorAbort(state, "new_data_fn argument to %s must be string", name);
277 goto done;
278 }
279 if (patch_data_fn->type != VAL_STRING) {
280 ErrorAbort(state, "patch_data_fn argument to %s must be string", name);
281 goto done;
282 }
283
284 UpdaterInfo* ui = (UpdaterInfo*)(state->cookie);
285 FILE* cmd_pipe = ui->cmd_pipe;
286
287 ZipArchive* za = ((UpdaterInfo*)(state->cookie))->package_zip;
288
289 const ZipEntry* patch_entry = mzFindZipEntry(za, patch_data_fn->data);
290 if (patch_entry == NULL) {
291 ErrorAbort(state, "%s(): no file \"%s\" in package", name, patch_data_fn->data);
292 goto done;
293 }
294
295 uint8_t* patch_start = ((UpdaterInfo*)(state->cookie))->package_zip_addr +
296 mzGetZipEntryOffset(patch_entry);
297
298 const ZipEntry* new_entry = mzFindZipEntry(za, new_data_fn->data);
299 if (new_entry == NULL) {
300 ErrorAbort(state, "%s(): no file \"%s\" in package", name, new_data_fn->data);
301 goto done;
302 }
303
304 // The transfer list is a text file containing commands to
305 // transfer data from one place to another on the target
306 // partition. We parse it and execute the commands in order:
307 //
308 // zero [rangeset]
309 // - fill the indicated blocks with zeros
310 //
311 // new [rangeset]
312 // - fill the blocks with data read from the new_data file
313 //
314 // bsdiff patchstart patchlen [src rangeset] [tgt rangeset]
315 // imgdiff patchstart patchlen [src rangeset] [tgt rangeset]
316 // - read the source blocks, apply a patch, write result to
317 // target blocks. bsdiff or imgdiff specifies the type of
318 // patch.
319 //
320 // move [src rangeset] [tgt rangeset]
321 // - copy data from source blocks to target blocks (no patch
322 // needed; rangesets are the same size)
323 //
324 // erase [rangeset]
325 // - mark the given blocks as empty
326 //
327 // The creator of the transfer list will guarantee that no block
328 // is read (ie, used as the source for a patch or move) after it
329 // has been written.
330 //
331 // Within one command the source and target ranges may overlap so
332 // in general we need to read the entire source into memory before
333 // writing anything to the target blocks.
334 //
335 // All the patch data is concatenated into one patch_data file in
336 // the update package. It must be stored uncompressed because we
337 // memory-map it in directly from the archive. (Since patches are
338 // already compressed, we lose very little by not compressing
339 // their concatenation.)
340
341 pthread_t new_data_thread;
342 NewThreadInfo nti;
343 nti.za = za;
344 nti.entry = new_entry;
345 nti.rss = NULL;
346 pthread_mutex_init(&nti.mu, NULL);
347 pthread_cond_init(&nti.cv, NULL);
348
349 pthread_attr_t attr;
350 pthread_attr_init(&attr);
351 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
352 pthread_create(&new_data_thread, &attr, unzip_new_data, &nti);
353
354 int i, j;
355
356 char* linesave;
357 char* wordsave;
358
359 int fd = open(blockdev_filename->data, O_RDWR);
360 if (fd < 0) {
361 ErrorAbort(state, "failed to open %s: %s", blockdev_filename->data, strerror(errno));
362 goto done;
363 }
364
365 char* line;
366 char* word;
367
Doug Zongker1d5d6092014-08-21 10:47:24 -0700368 // The data in transfer_list_value is not necessarily
369 // null-terminated, so we need to copy it to a new buffer and add
370 // the null that strtok_r will need.
371 transfer_list = malloc(transfer_list_value->size+1);
372 if (transfer_list == NULL) {
373 fprintf(stderr, "failed to allocate %zd bytes for transfer list\n",
374 transfer_list_value->size+1);
375 exit(1);
376 }
377 memcpy(transfer_list, transfer_list_value->data, transfer_list_value->size);
378 transfer_list[transfer_list_value->size] = '\0';
379
380 line = strtok_r(transfer_list, "\n", &linesave);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700381
382 // first line in transfer list is the version number; currently
383 // there's only version 1.
384 if (strcmp(line, "1") != 0) {
385 ErrorAbort(state, "unexpected transfer list version [%s]\n", line);
386 goto done;
387 }
388
389 // second line in transfer list is the total number of blocks we
390 // expect to write.
391 line = strtok_r(NULL, "\n", &linesave);
392 int total_blocks = strtol(line, NULL, 0);
393 // shouldn't happen, but avoid divide by zero.
394 if (total_blocks == 0) ++total_blocks;
395 int blocks_so_far = 0;
396
397 uint8_t* buffer = NULL;
398 size_t buffer_alloc = 0;
399
400 // third and subsequent lines are all individual transfer commands.
401 for (line = strtok_r(NULL, "\n", &linesave); line;
402 line = strtok_r(NULL, "\n", &linesave)) {
403 char* style;
404 style = strtok_r(line, " ", &wordsave);
405
406 if (strcmp("move", style) == 0) {
407 word = strtok_r(NULL, " ", &wordsave);
408 RangeSet* src = parse_range(word);
409 word = strtok_r(NULL, " ", &wordsave);
410 RangeSet* tgt = parse_range(word);
411
412 printf(" moving %d blocks\n", src->size);
413
414 allocate(src->size * BLOCKSIZE, &buffer, &buffer_alloc);
415 size_t p = 0;
416 for (i = 0; i < src->count; ++i) {
Doug Zongker1d5d6092014-08-21 10:47:24 -0700417 check_lseek(fd, src->pos[i*2] * (off_t)BLOCKSIZE, SEEK_SET);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700418 size_t sz = (src->pos[i*2+1] - src->pos[i*2]) * BLOCKSIZE;
419 readblock(fd, buffer+p, sz);
420 p += sz;
421 }
422
423 p = 0;
424 for (i = 0; i < tgt->count; ++i) {
Doug Zongker1d5d6092014-08-21 10:47:24 -0700425 check_lseek(fd, tgt->pos[i*2] * (off_t)BLOCKSIZE, SEEK_SET);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700426 size_t sz = (tgt->pos[i*2+1] - tgt->pos[i*2]) * BLOCKSIZE;
427 writeblock(fd, buffer+p, sz);
428 p += sz;
429 }
430
431 blocks_so_far += tgt->size;
432 fprintf(cmd_pipe, "set_progress %.4f\n", (double)blocks_so_far / total_blocks);
433 fflush(cmd_pipe);
434
435 free(src);
436 free(tgt);
437
438 } else if (strcmp("zero", style) == 0 ||
439 (DEBUG_ERASE && strcmp("erase", style) == 0)) {
440 word = strtok_r(NULL, " ", &wordsave);
441 RangeSet* tgt = parse_range(word);
442
443 printf(" zeroing %d blocks\n", tgt->size);
444
445 allocate(BLOCKSIZE, &buffer, &buffer_alloc);
446 memset(buffer, 0, BLOCKSIZE);
447 for (i = 0; i < tgt->count; ++i) {
Doug Zongker1d5d6092014-08-21 10:47:24 -0700448 check_lseek(fd, tgt->pos[i*2] * (off_t)BLOCKSIZE, SEEK_SET);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700449 for (j = tgt->pos[i*2]; j < tgt->pos[i*2+1]; ++j) {
450 writeblock(fd, buffer, BLOCKSIZE);
451 }
452 }
453
454 if (style[0] == 'z') { // "zero" but not "erase"
455 blocks_so_far += tgt->size;
456 fprintf(cmd_pipe, "set_progress %.4f\n", (double)blocks_so_far / total_blocks);
457 fflush(cmd_pipe);
458 }
459
460 free(tgt);
461 } else if (strcmp("new", style) == 0) {
462
463 word = strtok_r(NULL, " ", &wordsave);
464 RangeSet* tgt = parse_range(word);
465
466 printf(" writing %d blocks of new data\n", tgt->size);
467
468 RangeSinkState rss;
469 rss.fd = fd;
470 rss.tgt = tgt;
471 rss.p_block = 0;
472 rss.p_remain = (tgt->pos[1] - tgt->pos[0]) * BLOCKSIZE;
Doug Zongker1d5d6092014-08-21 10:47:24 -0700473 check_lseek(fd, tgt->pos[0] * (off_t)BLOCKSIZE, SEEK_SET);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700474
475 pthread_mutex_lock(&nti.mu);
476 nti.rss = &rss;
477 pthread_cond_broadcast(&nti.cv);
478 while (nti.rss) {
479 pthread_cond_wait(&nti.cv, &nti.mu);
480 }
481 pthread_mutex_unlock(&nti.mu);
482
483 blocks_so_far += tgt->size;
484 fprintf(cmd_pipe, "set_progress %.4f\n", (double)blocks_so_far / total_blocks);
485 fflush(cmd_pipe);
486
487 free(tgt);
488
489 } else if (strcmp("bsdiff", style) == 0 ||
490 strcmp("imgdiff", style) == 0) {
491 word = strtok_r(NULL, " ", &wordsave);
492 size_t patch_offset = strtoul(word, NULL, 0);
493 word = strtok_r(NULL, " ", &wordsave);
494 size_t patch_len = strtoul(word, NULL, 0);
495
496 word = strtok_r(NULL, " ", &wordsave);
497 RangeSet* src = parse_range(word);
498 word = strtok_r(NULL, " ", &wordsave);
499 RangeSet* tgt = parse_range(word);
500
501 printf(" patching %d blocks to %d\n", src->size, tgt->size);
502
503 // Read the source into memory.
504 allocate(src->size * BLOCKSIZE, &buffer, &buffer_alloc);
505 size_t p = 0;
506 for (i = 0; i < src->count; ++i) {
Doug Zongker1d5d6092014-08-21 10:47:24 -0700507 check_lseek(fd, src->pos[i*2] * (off_t)BLOCKSIZE, SEEK_SET);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700508 size_t sz = (src->pos[i*2+1] - src->pos[i*2]) * BLOCKSIZE;
509 readblock(fd, buffer+p, sz);
510 p += sz;
511 }
512
513 Value patch_value;
514 patch_value.type = VAL_BLOB;
515 patch_value.size = patch_len;
516 patch_value.data = (char*)(patch_start + patch_offset);
517
518 RangeSinkState rss;
519 rss.fd = fd;
520 rss.tgt = tgt;
521 rss.p_block = 0;
522 rss.p_remain = (tgt->pos[1] - tgt->pos[0]) * BLOCKSIZE;
Doug Zongker1d5d6092014-08-21 10:47:24 -0700523 check_lseek(fd, tgt->pos[0] * (off_t)BLOCKSIZE, SEEK_SET);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700524
525 if (style[0] == 'i') { // imgdiff
526 ApplyImagePatch(buffer, src->size * BLOCKSIZE,
527 &patch_value,
528 &RangeSinkWrite, &rss, NULL, NULL);
529 } else {
530 ApplyBSDiffPatch(buffer, src->size * BLOCKSIZE,
531 &patch_value, 0,
532 &RangeSinkWrite, &rss, NULL);
533 }
534
535 // We expect the output of the patcher to fill the tgt ranges exactly.
536 if (rss.p_block != tgt->count || rss.p_remain != 0) {
537 fprintf(stderr, "range sink underrun?\n");
538 }
539
540 blocks_so_far += tgt->size;
541 fprintf(cmd_pipe, "set_progress %.4f\n", (double)blocks_so_far / total_blocks);
542 fflush(cmd_pipe);
543
544 free(src);
545 free(tgt);
546 } else if (!DEBUG_ERASE && strcmp("erase", style) == 0) {
547 struct stat st;
548 if (fstat(fd, &st) == 0 && S_ISBLK(st.st_mode)) {
549 word = strtok_r(NULL, " ", &wordsave);
550 RangeSet* tgt = parse_range(word);
551
552 printf(" erasing %d blocks\n", tgt->size);
553
554 for (i = 0; i < tgt->count; ++i) {
555 uint64_t range[2];
556 // offset in bytes
Doug Zongker1d5d6092014-08-21 10:47:24 -0700557 range[0] = tgt->pos[i*2] * (uint64_t)BLOCKSIZE;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700558 // len in bytes
Doug Zongker1d5d6092014-08-21 10:47:24 -0700559 range[1] = (tgt->pos[i*2+1] - tgt->pos[i*2]) * (uint64_t)BLOCKSIZE;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700560
561 if (ioctl(fd, BLKDISCARD, &range) < 0) {
562 printf(" blkdiscard failed: %s\n", strerror(errno));
563 }
564 }
565
566 free(tgt);
567 } else {
568 printf(" ignoring erase (not block device)\n");
569 }
570 } else {
571 fprintf(stderr, "unknown transfer style \"%s\"\n", style);
572 exit(1);
573 }
574 }
575
576 pthread_join(new_data_thread, NULL);
577 success = true;
578
579 free(buffer);
580 printf("wrote %d blocks; expected %d\n", blocks_so_far, total_blocks);
581 printf("max alloc needed was %zu\n", buffer_alloc);
582
583 done:
Doug Zongker1d5d6092014-08-21 10:47:24 -0700584 free(transfer_list);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700585 FreeValue(blockdev_filename);
Doug Zongker1d5d6092014-08-21 10:47:24 -0700586 FreeValue(transfer_list_value);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700587 FreeValue(new_data_fn);
588 FreeValue(patch_data_fn);
589 return StringValue(success ? strdup("t") : strdup(""));
590}
591
592Value* RangeSha1Fn(const char* name, State* state, int argc, Expr* argv[]) {
593 Value* blockdev_filename;
594 Value* ranges;
595 const uint8_t* digest = NULL;
596 if (ReadValueArgs(state, argv, 2, &blockdev_filename, &ranges) < 0) {
597 return NULL;
598 }
599
600 if (blockdev_filename->type != VAL_STRING) {
601 ErrorAbort(state, "blockdev_filename argument to %s must be string", name);
602 goto done;
603 }
604 if (ranges->type != VAL_STRING) {
605 ErrorAbort(state, "ranges argument to %s must be string", name);
606 goto done;
607 }
608
609 int fd = open(blockdev_filename->data, O_RDWR);
610 if (fd < 0) {
611 ErrorAbort(state, "failed to open %s: %s", blockdev_filename->data, strerror(errno));
612 goto done;
613 }
614
615 RangeSet* rs = parse_range(ranges->data);
616 uint8_t buffer[BLOCKSIZE];
617
618 SHA_CTX ctx;
619 SHA_init(&ctx);
620
621 int i, j;
622 for (i = 0; i < rs->count; ++i) {
Doug Zongker1d5d6092014-08-21 10:47:24 -0700623 check_lseek(fd, rs->pos[i*2] * (off_t)BLOCKSIZE, SEEK_SET);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700624 for (j = rs->pos[i*2]; j < rs->pos[i*2+1]; ++j) {
625 readblock(fd, buffer, BLOCKSIZE);
626 SHA_update(&ctx, buffer, BLOCKSIZE);
627 }
628 }
629 digest = SHA_final(&ctx);
630 close(fd);
631
632 done:
633 FreeValue(blockdev_filename);
634 FreeValue(ranges);
635 if (digest == NULL) {
636 return StringValue(strdup(""));
637 } else {
638 return StringValue(PrintSha1(digest));
639 }
640}
641
642void RegisterBlockImageFunctions() {
643 RegisterFunction("block_image_update", BlockImageUpdateFn);
644 RegisterFunction("range_sha1", RangeSha1Fn);
645}